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You need to find out why you have low oil pressure. It is normal that as engine rpm's increase, the oil pressure will rise- the oil pump is moving oil faster. Even though your light goes out, you could still have critically low oil pressure. There should be sufficient pressure at idle to keep the light off. The light will come on when your oil pressure is almost nil- I believe for some it's as low as 8 psi. Normally, oil pressure at idle is specified anywhere from 15 to 40 psi. You would have to check specifications for your Expedition. To verify oil pressure, hook up a mechanical gauge at the oil pressure sending unit on the engine block. Check with a local shop.
The causes run from easy, simple to budget busting ruin. Low oil level, wrong grade oil, real old oil, oil leaks, internal oil leaks, worn oil pump, worn crankshaft bearings. It was pretty common on older very high mileage cars to have a fluttering oil light at stops and idle. It was time for a rebuild, or time to look for another car.
check the oil level and condition. Change it if it looks black or too thick. Have a mechanical oil gauge fitted to check that the electrical gauge is correct because the problem may be in the oil pressure sender unit. Check the viscosity of the oil used as now you should be down to the 15w30 range for the cold weather.
I'm assuming "white" smoke and not "black" since you didn't mention.
If white smoke, it's coolant or oil leaking into the cylinder heads while it is not running.
If oil and from leaking valve guide seals, it's not a serious thing and basically a nuisance. Just keep your motor oil level topped off until you have new seals installed or dispose of vehicle.
If coolant, it's a much more serious problem. The liquid in the head will do two things. One, foul the spark plug and possibly cause hydraulic lock (fluids cannot be compressed and cylinder locks up)
Check you oil level and if keeps going down a quart every few hundred miles, it's the valve seals.
Check your coolant. If down, it's possibly a head gasket leak, which is not uncommon for vintage and make.
If coolant keeps going down and not leaking on ground, that's a smoking gun, not to make a bad pun, for a leaking head gasket. At this point, it's prudent to first invest $10 on Barr's Leak Copper (looks like liquid copper in a jar) and add to your coolant system. Follow manufacturer's instructions and then see if problem either persists or abates.
If it abates, go and buy a lottery ticket since you're very lucky and solved a serious problem with an inexpensive fix.
SOUND LIKE FRONT CRANKSHAFT TIMING COVER SEAL OR REAR MAIN OIL SEAL LEAKING START ENGINE LET IT IDLE SEE IF YOU SEE OIL DRIPPING UNDERNEATH CAR LOOK FOR OIL LEAK AT TIMING COVER OR AT REAR OF ENGINE WHERE REAR MAIN SEAL LOCATED. CHECK ON TOP OF ENGINE INTAKE MANIFOLD AREA WHERE OIL PUMP DRIVE GEAR IS.O - RING AT THE OIL PUMP DRIVE GEAR WILL CAUSE LARGE OIL LEAK.OIL PUMP DRIVE GEAR IS LOCATED WHERE THE DISTRIBUTOR USE TO BE LOCATED.KEEP EYE ON OIL LEVEL IN CRANK CASE.KEEP PLENTY ENGINE OIL ON HAND UNTIL YOU FIX.I WOULD FIND LOCATE PROBLEM QUICK AS POSSIBLE BECAUSE OIL LEVEL GET TOO LOW ENGINE WILL SEIZE UP LACK OF OIL..
The cylinder head is located on the center of the engine. Yes it can be a worn out head gasket or piston rings. If the piston rings are worn out the oil is burnt that's why it emits white smoke. You will need to replace the head gasket and piston rings.
Hope this helps and thank you for using FixYa! Have a good one!
I would keep an eye closely on the oil and coolant. You want to make sure the coolant is not getting into the combution chamber. (Due to a bad head gasket or a crack) Normally white smoke is due to coolant mixed with oil, but...some moisture will look white for a couple seconds when cold. So... keep a good eye on fluids, and if you see a level going down, get it checked out.
Black smoke tells me your piston rings are worn. Also the fumes you have explained tells me the valve seals are worn and leaking oil as well
The leaking valve seals and pistion rings will expell the fumes out through the exhaust. If you check your oil level every 50 miles and the oil level is down a half quart or more serious engine wear has occured and needs to be rebuilt soon
mechanic is in error
smoking on acceleration after idling ( at lights etc) is valve stem seals
blue smoke on acceleration while travelling is an indication of excessive big end bearing clearance overloading the oil control rings
you don't say what type of transmission you have but if it is a CV transmission it could be a failing drive belt in the transmission especially if you have added normal atf oil at any time
Sounds like a miss fire, try a tune up if its been a while since your last one. Plugs wires air filter, etc.
Look at your exhaust with the car idling, if its dark grey then you have unburnt fuel in your exhaust and a tuneup is a good place to start. If it is blueish grey then you are probably burning oil and may need an intake gasket or valve seals.
Also check your fluid levels, especially coolant and oil. if the oil level is high and the coolant is low you may have a deeper issue and may need to take it to a repair shop.